What happens to the load when one SIV is lost?

When one Static Inverter Converter (SIV) is lost, the primary function of the remaining SIVs is to ensure that the overall system continues to operate efficiently. Therefore, the load transfers to another SIV. This design is intentional to maintain redundancy and reliability in the traction power supply system.

In a typical setup, SIVs are employed to provide auxiliary power for various systems within a train, such as lighting, HVAC, and control systems. By distributing the load across multiple SIVs, if one unit fails, the other units can compensate to prevent a significant loss of functionality. As a result, the remaining SIVs pick up the slack, ensuring the continuity of operation without exposing the system to abrupt disruptions.

This redundancy in power systems is essential for maintaining performance and safety in traction applications, allowing operations to continue even in the event of component failures.